Stay-bolt drill.



H. L. BARRI'GKMAN.

STAY BOLT DRILL. Arrnroulon num 00T. 1. 190s.-

Patentea De@h 27, 1910.

I Il v UNITED STATES PATENT OFFICE.

HARRY L. BARRICKMAN, OF RICHWOOD, WEST VIRGINIA, ASSIGNOR 0F ONE-THIRD TO HAZE MORGAN,

0F CLARKSBURG, WEST VIRGINIA.

STAY-BOLT DRILL.

Specification of Letters Patent.

Patented Dec. 27, 1910.

To all whom it may concer/n:

Be it known that I, HARRY L. BARRICK- MAN, a citizen of the United States, residing at Richwood, in the county of Nicholas and State of West Virginia, have invented a new and useful Stay-Bolt Drill, of which the following is a specification.

My invention is a stay-bolt drill for removing broken stay-bolts from the boilerplate or -sheet behind the engine frame and expansion pad of a locomotive steam-engine, without stripping the engine. I attain this result by means of the mechanism illustrated in the accompanying drawing wherein- Figure l is a side view of the device in operation, and Fig. 2 is a central longitudinal section thereof.

Similar letters refer to similar parts throughout.

In said drawings a is a drill-barrel consisting of a cylindrical piece of tool-steel, the length and diameter, approximately, of a stay-bolt, and threaded to correspond with the threads on a stay-bolt, fronrone end to the other, with the exce tion of the end farthest from the drill-bit, which end is not threaded, but is of a diameter approximately fifty per cent. greater than that of a staybolt, and Vwhich enlarged end is nut-shaped, to take the jaws of a wrench which may be used for turning or screwing said cylinder into the threaded hole in the boiler-plate or -sheet and upon the threads upon' the exterior surface of which barrel travels a threaded am-nut, c, and which barrel a is cylinder-bored its entire length to a caliber of approximately three-fourths of one inch and threaded on the inside its entire length to take a feed-screw, d, which feed-screw is also made of tool-steel, approximately 7 inches in length and of a diameter equal 'to the caliber of drill-barrel, a, with the exception of the end, e, farthest away from the seat of the drill-bit, which end e, for a distance of about one-fourth of one inch from its end, is enlarged to a diameter several times greater than that of the main feedscrew body and shaped into an annular disk; and which feed-screw, beginning at the end nearest the drill-bit, is spiraled or threaded on its periphery its entire true-cylindrical length to the disk, head or point of enlar ement on the other end, to correspon with the female threads within t e cylindrical-bored barrel, a; and is cylinder-bored its entire length, the caliber of said bore being approximately onehalf of one inch, to take the drill-spindle, f, which latter is steel, approximately eight inches in len h, true cylinder shaped from the end g, arthest away from the drill-bit end It, to a point i within about one inch of the drillbit end, lz., from which point, i, on to the end, 7L, of said spindle, f, the diameter of said spindle, f, is increased approximately fifty per cent; and, beginnin at a point, j, on the periphery of said en argement, approximately one-half inch from the enlarged end of said spindle, and covering the periphery of the entire portion of said enlargement between the points and z', a iuted spiral is laid, corresponding to the spiral or thread on the barrel, a; and said larger end, h, of which spindle contains, in the center thereof, an angular opening, lc, approximately one-half of one inch in diameter at its beginning and tapering as it sinks, and approximately three-fourths of one inch in depth, shaped so as to take and hold firmly and truly a drill-bit, Z; and the opposite end of which spindle, f, is shaped to connect with an air-motor or other suitable device, m, employed to impart a rotary motion to said spindle and drill-bit.

By means of my device, the drill-containing barrel, a, having been turned or screwed into the threaded stay-bolt hole of the anterior boiler-plate or -sheet, ai, and held firmly and rigidly therein by means of the jam-nut, c, the axisof the drill-bit, Z, is at all times, during the operation of the drillmechanism, held and maintained in a line with the axis of the broken piece of staybolt contained in the hole situated in the posterior boiler-plate or -sheet located approximately four inches in a diametrically opposite position from the stay-bolt hole in the anterior plate or sheet; and said drillbit, being) projected against said broken stay-bolt y means of the feed-screw d, and receiving a rotary motion imparted to it by the spindle, f, will cut out all of said broken stay-bolt, 'excepting the spiral or male thread, which latter will be left in the female thread in the boiler-plate or -sheet to be readily removed by the male thread on the spindle f, and the female thread will be cleaned out and trued in the same operation for a new stay-bolt.

a solid piece of tool-l What I claim as my invention and desire y barrel ca being screw-threaded from the end tosecure by LetterePateu-t isti nearest the drill-bi1; to. the enlargement at The combination ef a tubular barrel a, the opposite end of the barrel, and Said enhaving an enlargement at one end thereof, 1 largement being shaped to be engaged by a 15 a tubular feed screw Z screw-threaded i'm wreneh, and a jam-nut on Said screwsa'dd barrel a, a spindle f ittilng and longg i threaded periphery of the barre] a. tu mally movable in seid. eet: screw d, aan- 5 T x having a drill-bit secured at lone end thereof HARR L' BARRICKMAN' and the other end shaped to engage With zu Y vWitnesses-2 motor or other device suitable for imparting i S. A. BARRICKMAN, a, ret'ary motion to it, heperiphery of' the l MINNIE MoN'reoMmRY. 

